﻿////////////////////////////////////////////////////////////////////////////////////
//  CameraFilterPack v2.0 - by VETASOFT 2015 //////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////

Shader "CameraFilterPack/Edge_Edge_filter" {
	Properties 
	{
		_MainTex ("Base (RGB)", 2D) = "white" {}
		_TimeX ("Time", Range(0.0, 1.0)) = 1.0
		_Distortion ("_Distortion", Range(0.0, 1.0)) = 0.3
		_ScreenResolution ("_ScreenResolution", Vector) = (0.,0.,0.,0.)
		_RedAmplifier ("_RedAmplifier", Range(0.0, 10.0)) = 0.0
		_GreenAmplifier ("_GreenAmplifier", Range(0.0, 10.0)) = 2.0
		_BlueAmplifier ("_BlueAmplifier", Range(0.0, 10.0)) = 0.0
	}
	SubShader 
	{
		Pass
		{
			ZTest Always
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#pragma fragmentoption ARB_precision_hint_fastest
			#pragma target 3.0
			#include "UnityCG.cginc"
			
			uniform sampler2D _MainTex;
			uniform float _TimeX;
			uniform float _Distortion;
			uniform float4 _ScreenResolution;
			uniform float _RedAmplifier;
			uniform float _GreenAmplifier;
			uniform float _BlueAmplifier;
			
		       struct appdata_t
            {
                float4 vertex   : POSITION;
                float4 color    : COLOR;
                float2 texcoord : TEXCOORD0;
            };
 
            struct v2f
            {
                  half2 texcoord  : TEXCOORD0;
                  float4 vertex   : SV_POSITION;
                  fixed4 color    : COLOR;
           };   
             
  			v2f vert(appdata_t IN)
            {
                v2f OUT;
                OUT.vertex = mul(UNITY_MATRIX_MVP, IN.vertex);
                OUT.texcoord = IN.texcoord;
                OUT.color = IN.color;
                
                return OUT;
            }

			float4 getPixel(in int x, in int y, v2f i)
			{
				return tex2D(_MainTex, ((i.texcoord.xy * _ScreenResolution.xy) + float2(x, y)) / _ScreenResolution.xy);
			}

			float4 frag (v2f i) : COLOR
			{
				fixed4 sum = abs(getPixel(0, 1, i) - getPixel(0, -1, i));
				sum += abs(getPixel(1, 0, i) - getPixel(-1, 0, i));
				sum /= 2.0;
				fixed4 color = getPixel(0, 0, i);
				color.r += length(sum) * _RedAmplifier;
				color.g += length(sum) * _GreenAmplifier;
				color.b += length(sum) * _BlueAmplifier;
				return color;
			}
			
			ENDCG
		}
		
	}
}